Downhole Resistivity Permittivity Imaging for Rock Type Identification

The patent segments the formation measurement volume into multiple discrete sensing zones around the borehole. The imaging tool divides the formation into azimuthal sectors and vertical intervals, creating a segmented representation that captures heterogeneous patterns rather than averaging them. This segmentation allows distinct rock types and textures in different spatial locations to be identified separately.

The patent transitions from one-dimensional averaged log data to two-dimensional and three-dimensional imaging data. By adding azimuthal and vertical dimensions to the measurement, the system creates high-resolution images that display formation characteristics across multiple spatial dimensions, enabling visualization of heterogeneous distribution patterns that cannot be captured in averaged one-dimensional data.

The patent merges multiple measurement parameters (resistivity, permittivity, acoustic velocity, density) into a integrated imaging system. By combining these different physical properties in a multi-parameter imaging approach, the system creates images where rock type and texture can be identified through the combined signature of multiple measurements, not just resistivity alone. This merging allows the relationship between physical properties and rock characteristics to become apparent.

The patent uses composite imaging that integrates multiple types of formation data into unified rock type classifications. The system creates composite images that combine electrical, acoustic, and density information to produce a comprehensive characterization of rock types and textures, similar to how composite materials combine different properties to achieve enhanced performance.

The patent replaces the mechanical process of core acquisition, transport, and laboratory analysis with an in-situ imaging system. Instead of physically removing core samples and bringing them to the surface for measurement, the system uses downhole imaging tools to directly measure formation properties at the wellsite, substituting mechanical core handling with electronic sensing and imaging.

The patent creates digital copies of formation characteristics through imaging. The system generates high-resolution images that replicate the information obtained from core analysis, allowing formation characterization without physical core samples. These digital images serve as substitutes for traditional core photographs and laboratory measurement data.